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Since I've upgraded from PS 2017 to version 20.0.4, I'm seeing a grey 1 pixel line in the Thumbnail preview in the Layers panel - no matter which color theme and which thumbnail size I use. Is this supposed to indicate something?

enter image description here

Cheers Florian

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  • It's not the bug at all! it's just behaviour of photoshop i think because it seems visible when light theme is on and when you switch to dark theme it just becomes normal (yes it still exist but it is very hardly visible!)
    – Mr.Online
    Jul 1, 2019 at 8:13
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    Why does the layer panel thumbnail preview even matter? By definition "thumbnail" isn't mean to be a 100% accurate rendering.
    – Scott
    Mar 27, 2020 at 19:35

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My guess is that it's the same reason why an icon of hidden layers looks like on Windows this when zoomed in

enter image description here

And like this on Mac

enter image description here

And in CS6 the arrows of groups on Windows looked like it's a bit chipped:

enter image description here

And Grid in newest Photoshops looks like this when zoomed it:

enter image description here

— to make perfectionists and people with OCD go crazy.

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  • Indeed. Ever since Adobe apps support windows UI scaling, it has been plagued with these “off-by-one-pixel” bugs. I suspect that on MacOS it’s better because MacOS handles UI scaling differently. ( Dec 8, 2023 at 7:30
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An old question, but worth an answer I think.

It's part of the user interface colour theme. It has nothing to do with anything on the actual image, or any bug.

Here is a screenshot of what the layers panel looks like in the four colour schemes, from darkest to lightest. The white line is not present in the two darker themes, but is present in the two lighter grey themes.

enter image description here

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